The Ossiarch Bonereapers Nagash's personal army in the wars across reality. Like all factions in Age of Sigmar, they're getting updates as well with the new edition. Want to see what they're going to be like? Check out this preview.
From the article:
The new edition of Warhammer Age of Sigmar brings big changes to every faction in the game. We’ve already taken a look at the Stormcast Eternals, Orruk Warclans, and the mortal followers of Chaos, among others. We’ve rounded up all the faction articles here if you’re after a specific one. Today, we take a closer look at the Ossiarch Bonereapers, an army hand-crafted by Nagash to carve out new territory across the Mortal Realms.
The Ossiarch Bonereapers are Nagash’s elite army, created in secret and kept in hiding until just the right moment. They march with the lockstep precision of automatons, tirelessly advancing without any semblance of fear or doubt.